Metallic Crystal Structure
... temperature and pressure that in. Solid materials may be classified according to the regularity with which atoms or ions are arranged with respect to one another. A crystalline material is one in which the atoms are situated in a repeating or periodic array over large atomic distances; that is, long ...
... temperature and pressure that in. Solid materials may be classified according to the regularity with which atoms or ions are arranged with respect to one another. A crystalline material is one in which the atoms are situated in a repeating or periodic array over large atomic distances; that is, long ...
Time-resolved nonlinear optical spectroscopy
... • Multiferroic materials with both polar and magnetic order parameters usually show a relatively low-symmetry crystal structure due to the absence of both time and space inversion symmetries; hence, a strong interaction between the low-lying magnetic and lattice excitations can occur, leading to ri ...
... • Multiferroic materials with both polar and magnetic order parameters usually show a relatively low-symmetry crystal structure due to the absence of both time and space inversion symmetries; hence, a strong interaction between the low-lying magnetic and lattice excitations can occur, leading to ri ...
Spin Properties in InAs/GaAs Quantum Dot based Nanostructures
... areas of the scientific field is given, together with a description of applied characterization techniques and a summary of the obtained scientific results. The second part consists of the publications which present the main results in detail. ...
... areas of the scientific field is given, together with a description of applied characterization techniques and a summary of the obtained scientific results. The second part consists of the publications which present the main results in detail. ...
Metal
... weak in comparison to the primary or chemical ones; bonding energies are typically on the order of only 10 kJ/mol (0.1 eV/atom). Secondary bonding exists between virtually all atoms or molecules, but its presence may be obscured if any of the three primary bonding types is present. Secondary bonding ...
... weak in comparison to the primary or chemical ones; bonding energies are typically on the order of only 10 kJ/mol (0.1 eV/atom). Secondary bonding exists between virtually all atoms or molecules, but its presence may be obscured if any of the three primary bonding types is present. Secondary bonding ...
Spin relaxation in quantum dots with random spin
... information processing.1,2 The interaction of spins with the environment on the one hand allows necessary read and write procedures but on the other hand leads to losses of the information held by the system. Thus, a critical issue regarding the possibility to convert quantum dots into a hardware re ...
... information processing.1,2 The interaction of spins with the environment on the one hand allows necessary read and write procedures but on the other hand leads to losses of the information held by the system. Thus, a critical issue regarding the possibility to convert quantum dots into a hardware re ...
Adsorption energy and spin state of first
... Slab and cluster model spin-polarized calculations have been carried out to study various properties of isolated first-row transition metal atoms adsorbed on the anionic sites of the regular MgO共100兲 surface. The calculated adsorption energies follow the trend of the metal cohesive energies, indicat ...
... Slab and cluster model spin-polarized calculations have been carried out to study various properties of isolated first-row transition metal atoms adsorbed on the anionic sites of the regular MgO共100兲 surface. The calculated adsorption energies follow the trend of the metal cohesive energies, indicat ...
Theoretical Descriptions of Complex Magnetism in Transition Metals
... In this thesis, various methods for studying solids by simulations of quantummechanical equations, have been applied to transition metals and their alloys. Transition metals such as Fe, Ni, and Mn, are not only cornerstones in modern technology, but also key components in the very fabric of the Eart ...
... In this thesis, various methods for studying solids by simulations of quantummechanical equations, have been applied to transition metals and their alloys. Transition metals such as Fe, Ni, and Mn, are not only cornerstones in modern technology, but also key components in the very fabric of the Eart ...
Geometrical frustration
In condensed matter physics, the term geometrical frustration (or in short: frustration) refers to a phenomenon, where atoms tend to stick to non-trivial positions or where, on a regular crystal lattice, conflicting inter-atomic forces (each one favoring rather simple, but different structures) lead to quite complex structures. As a consequence of the frustration in the geometry or in the forces, a plenitude of distinct ground states may result at zero temperature, and usual thermal ordering may be suppressed at higher temperatures. Much studied examples are amorphous materials, glasses, or dilute magnets.The term frustration, in the context of magnetic systems, has been introduced by Gerard Toulouse (1977). Indeed, frustrated magnetic systems had been studied even before. Early work includes a study of the Ising model on a triangular lattice with nearest-neighbor spins coupled antiferromagnetically, by G. H. Wannier, published in 1950. Related features occur in magnets with competing interactions, where both ferro- as well as antiferromagnetic couplings between pairs of spins or magnetic moments are present, with the type of interaction depending on the separation distance of the spins. In that case commensurability, such as helical spin arrangements may result, as had been discussed originally, especially, by A. Yoshimori, T. A. Kaplan, R. J. Elliott, and others, starting in 1959, to describe experimental findings on rare-earth metals. A renewed interest in such spin systems with frustrated or competing interactions arose about two decades later, beginning in the 70s of the 20th century, in the context of spin glasses and spatially modulated magnetic superstructures. In spin glasses, frustration is augmented by stochastic disorder in the interactions, as may occur, experimentally, in non-stoichiometric magnetic alloys. Carefully analyzed spin models with frustration include the Sherrington-Kirkpatrick model, describing spin glasses, and the ANNNI model, describing commensurability magnetic superstructures.